Local traffic policies and irules together

Hi - i have a Question -

i have a policy that does a redirect - meaning if URI path is / redirect to /abc

for maintenance window i have a i rule that detects time and should redirect to a maintenance page

but the rule gives "Multiple redirect/respond invocations not allowed" -- how can i resolve this - meaning execute this irule

set static::start_date "2019-05-05 10:09"

 set static::end_date "2019-05-05 10:10"

 set static::start [clock scan $static::start_date]

 set static::end [clock scan $static::end_date] 

}

 when HTTP_REQUEST timing on { 

 set now [clock seconds] 

 if { not [class match [IP::client_addr] equals private_net] } {

 if {$now > $static::start and $now < $static::end}{ 

 HTTP::redirect "http://mytedirect-maintenance"